FAQ about release version numbers

doc/faq.wiki

@@ -36,6 +36,8 @@ Miscellaneous:
 
  [#xorriso_dialog_mode  What is xorriso dialog mode useful for ?]
 
+ [#version_numbers  Why is every second release missing ?]
+
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 '''Burning'''
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@@ -215,6 +217,15 @@ xorriso's stdin and stdout. This is more efficient than forking xorriso
 every now and then to perform various commands in order to complete
 complex tasks like image size prediction.
 
+===== Why is every second release missing ? ===== #version_numbers
+
+Releases have an even third version number. Like 0.5.6 or 1.0.4.
+During development the next higher odd number is used. E.g. 0.5.7 or 1.0.5.
+
+The content of release tarballs does not get changed without changing
+their name. The development tarballs of xorriso and cdrskin may change
+their content without notice.
+
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